mat

Definition of mat

1a(1): a piece of coarse, woven, plaited, or felted fabric used especially as a floor covering or a support (2): a piece of material placed at a door for wiping soiled shoe solesb: a decorative piece of material used under a small item (as a dish) especially for support or protectionc: a large thick pad or cushion used as a surface for wrestling, tumbling, and gymnastics

2: something made up of densely tangled or adhering filaments or strands especially of organic matter <an algal mat><a mat of unkempt hair>

3: a large slab usually of reinforced concrete used as the supporting base of a building